This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A054407 #8 Oct 25 2016 21:14:31 %S A054407 0,0,0,36,7860,4177152,8589313152,70368605798400,2305842990423490560, %T A054407 302231454885790246502400,158456325028519245775644917760, %U A054407 332306998946228931044233275859009536,2787593149816327892614636032925171439370240 %N A054407 Number of asymmetric n X n binary matrices under action of dihedral group of the square D_4. %H A054407 Colin Barker, <a href="/A054407/b054407.txt">Table of n, a(n) for n = 0..50</a> %F A054407 (1/8)*(2^(n^2)-2*2^((n^2+n)/2)-3*2^(n^2/2)+2*2^(n^2/4)+2*2^((n^2+2*n)/4)) if n is even and (1/8)*(2^(n^2)-4*2^((n^2+n)/2)-2^((n^2+1)/2)+4*2^((n^2+2*n+1)/4)) if n is odd. - Corrected by _Colin Barker_, Oct 25 2016 %Y A054407 Cf. A054247. %K A054407 easy,nonn %O A054407 0,4 %A A054407 _Vladeta Jovovic_, May 08 2000 %E A054407 More terms from _Colin Barker_, Oct 25 2016